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Bulk amorphous steels based on Fe alloys

a technology of fe alloys and bulk amorphous steels, applied in the field of fe-based bulk amorphous (glass) steel compositions, can solve the problems of preventing wide-spread industrial application, low gfa of fe-based amorphous steels, etc., and achieves high gfa, reduced material cost, and high strength.

Inactive Publication Date: 2005-02-17
UT BATTELLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Accordingly, objects of the present invention include the provision of new and improved Fe-based steel compositions that have high GFA, that are made with inexpensive materials, can be formed into articles having cross-sections of at least 8 to 12 mm, high strength, corrosion resistance, and reduced material cost. Further and other objects of the present invention will become apparent from the description contained herein.

Problems solved by technology

However, one major obstacle to the feasibility of Fe based amorphous steels is their typically low GFA.
Although thin ribbons with a thickness of <100 μm have been successfully utilized in many application fields, such limitations have prevented wide spread industrial application thereof.

Method used

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  • Bulk amorphous steels based on Fe alloys
  • Bulk amorphous steels based on Fe alloys
  • Bulk amorphous steels based on Fe alloys

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Embodiment Construction

For purposes of this invention, a “fully” amorphous metallic glass (amorphous alloy) product is defined as a material which contains no less than 90% amorphous phase. This is a substantial and unexpected increase attributable to the compositions of the present invention. Frequently, materials produced in practice of the present invention comprise a single amorphous phase. The approximate chemical formula of the compositions of the present invention can be expressed as follows:

Fe(100-a-b-c-d-e)YaMnbTcMdXe

In the above formula: T is at least one of Ni, Cu, Cr and Co M is one or plurality of W, Mo, Nb, Ta, Al and Ti X is one or plurality of B, C and Si a, b, c, d and e are atomic percentages, wherein a<5 b≦25 c≦25 d≦25 5≦e≦30

It is preferable in the present invention that the element X is represented by:

CfBg

Wherein: f+g=e f<25 g<15 10≦e≦25

More preferably, a very good glass-forming alloy within the composition range described above has the approximat...

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Abstract

A bulk amorphous alloy has the approximate composition: Fe(100-a-b-c-d-e)YaMnbTcMdXe wherein: T includes at least one of the group consisting of: Ni, Cu, Cr and Co; M includes at least one of the group consisting of W, Mo, Nb, Ta, Al and Ti; X includes at least one of the group consisting of Co, Ni and Cr; a is an atomic percentage, and a<5; b is an atomic percentage, and b≦25; c is an atomic percentage, and c≦25; d is an atomic percentage, and d≦25; and e is an atomic percentage, and 5≦e≦30.

Description

FIELD OF THE INVENTION The present invention relates to Fe-based bulk amorphous (glass) steel compositions, and more particularly to Fe-based bulk amorphous steel compositions containing Fe as a major component, Y and Mn, at least one of Ni, Cu, Cr and Co, at least one of C, B and Si, and at least one of Mo, W, Nb, Ta, Ti and Al, and which are characterized by enhanced glass-forming ability (GFA), high material strength, and low material cost. BACKGROUND OF THE INVENTION Although conventional steels with crystalline structure, containing various carbon levels, have been extensively utilized by industries, bulk amorphous steels having glassy microstructure show great potential to supercede crystalline steels for some structural and functional applications due to their superior properties, such as higher strength, better magnetic properties and better corrosion resistance. For example, some known bulk Fe based amorphous alloys have shown a hardness of above HV1200, which is twice th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C45/02
CPCC22C45/02
Inventor LU, ZHAOPINGLIU, CHAIN T.
Owner UT BATTELLE LLC
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